MSI MS-7069 archive in RAR format, the largest of this group at 11.9 MB. The name states no revision or contents, so it is unclear whether it holds schematics, boardview files, BIOS images or a combination; extract it to check. Schematics let you trace power rails and signals, while boardviews locate components and test points when hunting a short. MSI numbers desktop motherboards in the MS-7xxx series; confirm the revision printed on the PCB before relying on the documents.
The button opens the matching file on RM Schematics, or a source page if it is not catalogued there yet. The original attachment is from @IT_SERVICE_WORLD. Enginerys does not host this file.
How to open a .rar file
Compressed archive — the usual wrapper for a schematic + boardview pair or a BIOS + EC set.